Hi: On a whim yesterday after about a 20 minute session on the track, I took the infrared temp gun and shot the transmission. I was amazed that the top rear of the transmission was 210 - 220 and the top of the transmission above the axles was 250F. This was my third session of about 25 minutes driving with about 35 minutes off. I have a 5MT from a Legacy GT with a Modena TBD LSD. I talked to Paul at Yimisport (they build monster Subaru Time Attack cars) and he said 250 was the max. He also said this is a splash lubricated transmission, so adding a cooler would be a bit of a project with plumbing, a cooler and a pump. He recommended changing the fluid every two to three track days and likes Motul 300.

Has anybody had any experience with the transmission temperature issue, or is this a non-issue? I've never looked. What are the other track cars doing about their transmissions? Has anybody looked at the temperature?